Invention Grant
- Patent Title: Digital zero IF selectivity section
- Patent Title (中): 数字零中频选择部分
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Application No.: US861958Application Date: 1986-05-12
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Publication No.: US4733403APublication Date: 1988-03-22
- Inventor: Daniel A. Simone
- Applicant: Daniel A. Simone
- Applicant Address: IL Schaumburg
- Assignee: Motorola, Inc.
- Current Assignee: Motorola, Inc.
- Current Assignee Address: IL Schaumburg
- Main IPC: H04B1/30
- IPC: H04B1/30 ; H03D3/00 ; H03D7/16 ; H03H17/00 ; H03H17/02 ; H04B1/10 ; G06G7/02
Abstract:
Disclosed is a digital zero-IF selectivity section circuit which operates on a recovered input signal, digitally clocked by a first clock at a rate of FS, in receiver device. The circuit uses a second clock operating at a lesser rate than the first clock to clock an N-order FIR digital filtering means to selectively band-limit the frequency spectrum of the recovered input signal. A second digital filtering means is coupled to the output of the first FIR digital filtering means. The second digital filtering means operates at a clock speed less than or equal to the second clock speed. The second digital filtering means is used to further selectively band-limit the frequency spectrum of the recovered input signal.
Public/Granted literature
- US5830330A Method and apparatus for low pressure sputtering Public/Granted day:1998-11-03
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